<template>
  <div class="todo-footer" v-show="todoList.length">
    <label>
      <input type="checkbox" v-bind:checked="allTotal === doneTotal" @change="updeleteAll"/>
    </label>
    <span> <span>已完成{{doneTotal}}</span> / 全部{{allTotal}} </span>
    <button class="btn btn-danger" @click="deleteTodoDone">清除已完成任务</button>
  </div>
</template>

<script>
import {mapState,mapMutations} from 'vuex'

export default {

   computed:{
    ...mapState(['todoList']),
    allTotal(){
        return  this.todoList.length
    },
    doneTotal(){
        return this.todoList.filter(item=>item.isDone).length
    }
  },
  methods:{
    ...mapMutations(['updeleteAll']),
    ...mapMutations(['deleteTodoDone'])
  }
}
</script>

<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
